Ligand-Free, Quinoline N-Assisted Copper-Catalyzed Nitrene Transfer Reaction To Synthesize 8-Quinolylsulfimides
作者:Xinsheng Xiao、Sanping Huang、Shanshan Tang、Guokai Jia、Guangchuan Ou、Yangyan Li
DOI:10.1021/acs.joc.9b00281
日期:2019.6.21
An efficient copper-catalyzed, quinolyl N-directed nitrene transferreaction to 8-quinolylsulfides was described. A variety of 8-quinolylsulfimides with different functional groups were synthesized in moderate to high yields. The obtained 8-quinolylsulfimides were proved to be promising novel type of bidentate ligands in Pd(II)-catalyzed allylic alkylation.
Palladium-Catalyzed β-C–H Arylation of Alkyl Carboxamides with Sterically Hindered Aryl Iodides Using <i>ortho</i>-Sulfinyl Aniline Auxiliaries
作者:Delong Mu、Fang Gao、Gong Chen、Gang He
DOI:10.1021/acscatal.6b03661
日期:2017.3.3
ortho-sulfinylaniline auxiliaries for palladium-catalyzed β–C-H arylation of alkyl carboxamides. Together, these auxiliaries offer a means to effect efficient β-methyl and methylene C–H bond arylation with sterically hindered aryl iodides. ortho-Methylsulfinylaniline (MSOA) enables efficient β-methyl C–H arylation of propanamide substrates with aryl iodides bearing various ortho-substituents including alkyl
Auxiliary-Assisted Palladium-Catalyzed Arylation and Alkylation of sp<sup>2</sup> and sp<sup>3</sup> Carbon−Hydrogen Bonds
作者:Dmitry Shabashov、Olafs Daugulis
DOI:10.1021/ja910900p
日期:2010.3.24
We have developed a method for auxiliary-directed, palladium-catalyzed beta-arylation and alkylation of sp(3) and sp(2) C-H bonds in carboxylic acid derivatives. The method employs a carboxylic acid 2-methylthioaniline- or 8-aminoquinoline amide substrate, aryl or alkyl iodide coupling partner, palladium acetate catalyst, and an inorganic base. By employing 2-methylthioaniline auxiliary, selective monoarylation of primary sp(3) C-H bonds can be achieved. If arylation of secondary sp(3) C-H bonds is desired, 8-aminoquinoline auxiliary may be used. For alkylation of sp(3) and sp(2) C-H bonds, 8-aminoquinoline auxiliary affords the best results. Some functional group tolerance is observed and amino- and hydroxy-acid derivatives can be functionalized. Preliminary mechanistic studies have been performed. A palladacycle intermediate has been isolated, characterized by X-ray crystallography, and its reactions have been studied.